Hopkins-Shumenov was a unification bout. That's better than a proposed Kovalev/Caparello fight. Kovalev/Caparello is about the same level as a Stevenson/Fonfara fight. Of course, Stevenson/Fonfara is a huge mismtach and Kovalev's last two fights on HBO have been blatant mismatches. Hopefully they can get Kovalev in some good matchups in the near future.
I watched a couple of Caparello's fights, and he's a bit wild, and tends to keep his hands down. I don't see any other outcome but an early KO for Kovalev.